The HERMES Technologic and Scientific Pathfinder will include a siswich detector, which is capable of performing spectroscopy in the range from 2 keV to 2 MeV as a single monolithic detector. To do this, the siswich combines a solid-state Silicon Drift Detector and a scintillator crystal. However, a spectroscopic calibration pipeline has not been standardized yet for these instruments. In this work, we present the newly developed HERMES calibration pipeline, mescal, which is intended for laboratory on-ground raw HERMES data energy calibration and formatting. This software is designed to minimize user interaction, thus including an automatic calibration line identification, and an automatic linear, independent calibration for each pixel in both operating modes. The mescal pipeline can set the basis for similar applications in future siswich telescopes.
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